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Listeria sp. bacteria, coloured transmission electron micrograph (TEM). Listeria are Gram-positive rod-shaped bacteria. The species L. monocytogenes is a human pathogen, causing the disease listeriosis. Symptoms of listeriosis include fever, meningitis and encephalitis (swelling of the brain). It is caught from contaminated food and is most common in newborns, the elderly and immunocompromised patients. Magnification: x16,600 when printed at 10 centimetres wide.
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